GStreamer Plugin The Moq GStreamer plugin provides moqsrc and moqsink elements for integrating Moq into GStreamer pipelines. This enables efficient media processing and streaming with full control over encoding, decoding, and transformations.
This plugin is currently under development but works well for most use cases. Contributions are welcome!
Overview The GStreamer plugin provides two main elements:
moqsink : Publish media to Moq relaysmoqsrc : Subscribe to Moq broadcasts
Repository The plugin is maintained in a separate repository:
Moq GStreamer Plugin View source code, installation instructions, and examples
Installation
Ensure GStreamer development libraries are installed:
sudo apt-get install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev
sudo dnf install gstreamer1-devel gstreamer1-plugins-base-devel
brew install gstreamer gst-plugins-base
git clone https://github.com/moq-dev/gstreamer cd gstreamer
Copy the built plugin to your GStreamer plugins directory:
cp target/release/libhang_gst.so ~/.local/share/gstreamer-1.0/plugins/
On macOS, the extension is .dylib instead of .so.
Check that GStreamer recognizes the plugin:
gst-inspect-1.0 moqsink gst-inspect-1.0 moqsrc Publishing with moqsink Basic Publishing Pipeline Publish a test video pattern:
gst-launch-1.0 videotestsrc ! x264enc ! \ isofmp4mux name=mux chunk-duration= 1 fragment-duration= 1 ! \ moqsink url=https://cdn.moq.dev/anon broadcast=test
Publish from Webcam Stream from a video device:
Linux (v4l2)
macOS (avfoundation)
gst-launch-1.0 v4l2src device=/dev/video0 ! \ videoconvert ! x264enc tune=zerolatency ! \ isofmp4mux chunk-duration= 1 fragment-duration= 1 ! \ moqsink url=https://relay.example.com/anon broadcast=webcam
Publish with Audio Include audio in your stream:
gst-launch-1.0 \ videotestsrc ! videoconvert ! x264enc ! mux.video \ audiotestsrc ! audioconvert ! avenc_aac ! mux.audio \ isofmp4mux name=mux chunk-duration= 1 fragment-duration= 1 ! \ moqsink url=https://relay.example.com/anon broadcast=test
Publish a File Stream a video file:
gst-launch-1.0 filesrc location=video.mp4 ! \ qtdemux ! h264parse ! mux.video \ isofmp4mux name=mux chunk-duration= 1 fragment-duration= 1 ! \ moqsink url=https://relay.example.com/anon broadcast=video
Subscribing with moqsrc Basic Playback Pipeline Subscribe and play a Moq broadcast:
gst-launch-1.0 moqsrc url=https://cdn.moq.dev/anon broadcast=test ! \ decodebin ! autovideosink
Save to File Record a Moq broadcast to a file:
gst-launch-1.0 moqsrc url=https://relay.example.com/anon broadcast=stream ! \ filesink location=output.mp4
Transcode and Republish Subscribe, transcode, and republish:
gst-launch-1.0 \ moqsrc url=https://relay.example.com/anon broadcast=source ! \ decodebin ! videoconvert ! \ x264enc bitrate= 1000 ! \ isofmp4mux chunk-duration= 1 fragment-duration= 1 ! \ moqsink url=https://relay.example.com/anon broadcast=transcoded
moqsink Properties Configure the moqsink element:
Property Type Default Description urlstring required Relay server URL broadcaststring required Broadcast name jwtstring - Authentication token
Example with Properties gst-launch-1.0 videotestsrc ! x264enc ! \ isofmp4mux chunk-duration= 1 fragment-duration= 1 ! \ moqsink url="https://relay.example.com/anon" \ broadcast="my-stream" \ jwt="<token>"
moqsrc Properties Configure the moqsrc element:
Property Type Default Description urlstring required Relay server URL broadcaststring required Broadcast name jwtstring - Authentication token
Advanced Pipelines Multi-Bitrate Publishing Publish multiple quality levels:
gst-launch-1.0 videotestsrc ! tee name=t \ t. ! queue ! videoscale ! video/x-raw,width=1920,height= 1080 ! \ x264enc bitrate= 5000 ! isofmp4mux ! \ moqsink url=https://relay.example.com/anon broadcast=high \ t. ! queue ! videoscale ! video/x-raw,width=1280,height= 720 ! \ x264enc bitrate= 2500 ! isofmp4mux ! \ moqsink url=https://relay.example.com/anon broadcast=medium
Screen Capture Capture and stream your screen:
gst-launch-1.0 ximagesrc ! \ videoconvert ! x264enc tune=zerolatency ! \ isofmp4mux chunk-duration= 1 fragment-duration= 1 ! \ moqsink url=https://relay.example.com/anon broadcast=screen
Low Latency Configuration Optimize for minimal latency:
gst-launch-1.0 videotestsrc ! \ x264enc tune=zerolatency bitrate= 2000 \ key-int-max= 30 bframes= 0 \ byte-stream= true threads= 0 ! \ isofmp4mux chunk-duration= 1 fragment-duration= 1 \ streamable= true fragment-mode=first-moov-then-finalise ! \ moqsink url=https://relay.example.com/anon broadcast=lowlatency
Key parameters for low latency:
tune=zerolatency: Disables lookaheadkey-int-max=30: Frequent keyframes (every 1 second at 30fps)bframes=0: No B-frameschunk-duration=1: 1-second fragments Debugging Enable Debug Output Set GStreamer debug level:
GST_DEBUG = moqsink:5,moqsrc:5 gst-launch-1.0 ...
Inspect Pipeline Visualize your pipeline:
GST_DEBUG_DUMP_DOT_DIR = . gst-launch-1.0 ... dot -Tpng pipeline.dot -o pipeline.png
More Examples Check the repository’s justfile for additional examples:
Troubleshooting Plugin Not Found
Verify plugin is in GStreamer plugins directory
Run gst-inspect-1.0 moqsink to check installation
Set GST_PLUGIN_PATH if using custom location
Connection Errors
Check relay URL is accessible
Verify firewall allows UDP traffic
Ensure JWT token is valid if using authentication
Pipeline Errors
Verify all elements are installed (gst-inspect-1.0 <element>)
Check element capabilities match (use gst-inspect-1.0)
Enable debug output to identify bottlenecks
Next Steps
Deploy a Relay Set up your own relay server
FFmpeg Integration Alternative command-line publishing
Web Playback Watch streams in the browser
OBS Plugin Stream using OBS Studio
